科学兴趣小组对调查的生物进行分类，他们将鲤鱼、螃蟹、水草归为

科学兴趣小组对调查的生物进行分类，他们将鲤鱼、螃蟹、水草归为一类，将蝗虫、鸡、松树归为一类，他们的分类依据是（　　）

A．按生物的用途 B．按生物的生活环境

C．按生物的生长状况 D．按生物的形态结构

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科学兴趣小组对调查的生物进行分类，他们将鲤鱼、螃蟹、水草归为

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